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plot: fix line not plotted in polar projection #8984

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Merged
joa-quim merged 2 commits into from
Apr 16, 2026
+16 −1
Merged

plot: fix line not plotted in polar projection #8984

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62754b1
plot: fix line not plotted in polar projection
joa-quim Apr 16, 2026
845ec10
Merge branch 'master' into fix-878
joa-quim Apr 16, 2026
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17 changes: 16 additions & 1 deletion src/gmt_map.c
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Original file line number Diff line number Diff line change
Expand Up @@ -799,7 +799,7 @@ GMT_LOCAL unsigned int gmtmap_wesn_crossing (struct GMT_CTRL *GMT, double lon0,
* entirely outside the region but still cut through it, we first find all possible candidates and then decide
* which ones are valid crossings. We may find 0, 1, or 2 intersections */

unsigned int n = 0, i;
unsigned int n = 0, i, j;
double d, x0, y0;

/* If wrapping is allowed: first bring both points between W and E boundaries,
Expand Down Expand Up @@ -883,6 +883,21 @@ GMT_LOCAL unsigned int gmtmap_wesn_crossing (struct GMT_CTRL *GMT, double lon0,

if (n == 0) return (0);

/* Discard crossings on boundaries that are not real edges (e.g., the pole in
* polar projections where edge[0]=false, or a pole-enclosing boundary in many
* geographic projections). Must happen before corner checks below. See #878. */
for (i = j = 0; i < n; i++) {
if (sides[i] < 4 && !GMT->current.proj.edge[sides[i]]) continue; /* Skip non-edge */
if (j < i) {
clon[j] = clon[i]; clat[j] = clat[i];
sides[j] = sides[i];
}
j++;
}
n = j;

if (n == 0) return (0);

for (i = 0; i < n; i++) {
gmt_geo_to_xy (GMT, clon[i], clat[i], &xx[i], &yy[i]);
if (GMT->current.proj.projection_GMT == GMT_POLAR && sides[i]%2) sides[i] = 4 - sides[i]; /* toggle 1 <-> 3 */
Expand Down
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